var code="" ; //在全局 定义验证码
	function createCode(){ 
	code = "";
	var codeLength = 6;//验证码的长度
	var checkCode = document.getElementById("checkCode");
	checkCode.value = "";
	var selectChar = new Array(0,1,2,3,4,5,6,7,8,9,'A','B','C','D','E','F','G','H','J','K','L','M','N','P','Q','R','S','T','U','V','W','X','Y','Z');

	for(var i=0;i<codeLength;i++) {
	   var charIndex = Math.floor(Math.random()*32);
	   code +=selectChar[charIndex];
	}
	if(code.length != codeLength){
	   createCode();
	}
	$("#checkCode").html(code);
	}

	function validate (){
		var name = $('#name').val();
		var tel = $('#tel').val();
		var email = $('#email').val();
		var title = $('#title').val();
		var inputCode = document.getElementById("checkNum").value.toUpperCase();
		if(name=='' ){
			alert("请输入昵称！");
			createCode();
			return false;
		}
		if(tel==''){
			alert("请输入电话号码！");
			createCode();
			return false;
		}
		else if(tel!=''){
			var match = /(^[0-9]{3,4}\-[0-9]{7,8}$)|(^[0-9]{7,8}$)|(^\([0-9]{3,4}\)[0-9]{3,8}$)|(^0{0,1}13[0-9]{9}$)|(13\d{9}$)|(15[0135-9]\d{8}$)|(18[267]\d{8}$)/;
			if (!match.exec(tel)) {
			    alert("电话号码格式不对，正确格式如下：\n座机号码：021-4213550(或)\n手机号码：13635456878");
			   }
		}
		if(email!=''){
			 var search_str = /^[\w\-\.]+@[\w\-\.]+(\.\w+)+$/;
			 if(!search_str.test(email)){       
				 alert("请输入正确格式的E-mail地址！");
				 createCode();
			     return false;
			 }
		}
		if(title==''){
			alert("请输入标题！");
			createCode();
			return false;
		}
		if(inputCode.length <=0) {
		   alert("请输入验证码！");
		   createCode();
		   return false;
		}
		if(inputCode != code ){
		   alert("验证码输入错误！");
		   createCode();
		   return false;
		}
		else {
		   return true;
		}
	}